Display screen or portion thereof with a graphical user interface for physiological monitoring



The sole FIGURE is a front view of the display screen or portion thereof with a graphical user interface for physiological monitoring.

The dashed broken lines in the drawings depict environmental structure that forms no part of the claimed design, and the dash-dot-dash broken line perimeter surrounding the display screen or portion thereof in the drawings indicates the boundaries of the claim and forms no part thereof. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface for physiological monitoring, as shown and described. 